B classify different kinds of reading materials C give suggestions for reading practice D. set a pace in reading 15.All of the following points are hints for reading practice given by the author pt A checking your progress through pacing B. setting aside time each day for general reading C doing lightning speed exercise D. recalling the thread of the story already read The early scientific study of chemistry, known as alchemy grew up in the first few centuries A D. at Alexandria in Egypt. There two important things came together: one was the practical knowledge of the Egyptian workers in metals, pottery and dyes the other was the learning of the earlier Greek philosophers, such as Hippocrates and Aristotle. At the same time alchemy was much influenced by ideas from the east about magic and astrology(占星术) foretelling the future from the stars. Greek philosophers regarded debate about the nature of matter as superior to experiment and some held that all matter was made up of the same four elements earth fire air and water. Many people therefore thought that if these elements could be rearranged, one substance could be changed into another. For instance, a base metal could perhaps be turned into gold The chief aim of the alchemists was to find a way of doing this Alchemy came under Arab influence when the armies of Islam conquered Egypt during the seventh century. The Arabs carried its study into Western Europe when they advanc into spain the greatest arab alchemist was Jabir ibn Hayyan, possibly the same person as Geber, author of two important books on alchemy known from the Latin translations of the thirteenth century Jabir claimed that mercury(水银) and sulphur(硫磺)were“ elements" like the four Greek ones. He said that all metals were composed of mercury and sulphur in different proportions. To change a base metal into gold required the proportions to be changed by the action of a mysterious substance which came to be calledB. classify different kinds of reading materials C. give suggestions for reading practice D. set a pace in reading 15.All of the following points are hints for reading practice given by the author except ____. A. checking your progress through pacing B. setting aside time each day for general reading C. doing lightning speed exercise D. recalling the thread of the story already read 4 The early scientific study of chemistry,known as alchemy,grew up in the first few centuries A.D. at Alexandria in Egypt.There two important things came together:one was the practical knowledge of the Egyptian workers in metals,pottery and dyes;the other was the learning of the earlier Greek philosophers,such as Hippocrates and Aristotle.At the same time alchemy was much influenced by ideas from the East about magic and astrology（占星术）— foretelling the future from the stars. Greek philosophers regarded debate about the nature of matter as superior to experiment,and some held that all matter was made up of the same four “elements” — earth,fire,air and water.Many people therefore thought that if these elements could be rearranged,one substance could be changed into another.For instance,a base metal could perhaps be turned into gold.The chief aim of the alchemists was to find a way of doing this. Alchemy came under Arab influence when the armies of Islam conquered Egypt during the seventh century.The Arabs carried its study into Western Europe when they advanec into Spain.The greatest Arab alchemist was Jabir ibn Hayyan,possibly the same person as Geber,author of two important books on alchemy known from the Latin translations of the thirteenth century.Jabir claimed that mercury （水银）and sulphur（硫磺）were “elements”like the four Greek ones.He said that all metals were composed of mercury and sulphur in different proportions.To change a base metal into gold required the proportions to be changed by the action of a mysterious substance which came to be called